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ogimage.website
OG Image Generator is a free web tool for creating open graph images, social media previews, and Twitter cards. It offers customizable templates, fonts, and optional app screenshot support, exporting images as 1200×630 PNG files.
ogmo-editor-3.github.io
Ogmo Editor 3 is a free, open source, project oriented level editor made for indie game developers by indie game developers. It offers a project based workflow, layer types for tiles, decals, entities and grids, and saves levels to JSON files. It is free to use for personal and commercial projects and is open sourced under the MIT license.
data.ok.gov
Oklahoma's Open Data provides access to data and statistics about the activities of Oklahoma's government. The site organizes datasets into groups and showcases on topics including education, business, health, and public safety, and lists popular datasets such as state payroll files.
oldergeeks.com
OlderGeeks.com is a free software download site without ads, misleading download links or other annoyances. It states that downloads are clean and the site is supported by donations. It lists software downloads by category and a most-downloaded-files section.
omniweb.gsfc.nasa.gov
OMNIWeb is a NASA Space Physics Data Facility service providing hourly near-Earth solar wind magnetic field and plasma data, energetic proton fluxes above 1 to 60 MeV, and geomagnetic and solar activity indices. It offers plots, listings, output files, scatter plots with linear regression fits, and event or hourly lists with filtering.
ondoku3.com
Ondoku is text-to-speech software that reads text up to 5,000 characters free of charge and offers paid plans converting up to 1 million characters a month. Generated audio can be saved as MP3 files and used commercially. It runs in a browser on PC or smartphone without installation.
oneconverter.com
OneConverter is a free online service for converting PDF files and units of measure, intended for work, study and business. It offers file conversion, unit converters and PDF tools such as merging, splitting and compressing, and works on Windows, Mac and Linux with an internet connection.
t.me
Telegram link is a Telegram channel, bot, or group for updates, links, files, or community posts.
onionshare.org
OnionShare is an open-source tool for securely and anonymously sharing files, hosting websites, and chatting over the Tor network. It is available as desktop apps for Windows, macOS and Linux, and as mobile apps for Android and iOS. It is also preinstalled in operating systems such as Qubes OS, Tails and ParrotOS.
mediaarea.net
MediaInfoOnline is an online file analyzer that lets users run MediaInfo in a browser without installing software on their computer. Files are dragged into the page and an MediaInfo report is displayed; processing stays on the user's machine and nothing is uploaded to servers. It is provided as a technology preview.
fviewer.com
Online cloud file viewer that opens files in many formats without download or installation, including AI, PSD, DICOM, SVG, TIFF, VSD, CR2, Office, EPS, XPS, CDR, DJVU and EPUB. It also offers an EPUB reader for reading eBooks online.
online2pdf.com
Online2PDF is a free online PDF converter that combines conversion, merging, editing, compression, unlocking and protection in one interface. It converts Word, Excel, PowerPoint, OpenOffice, image and XPS files to PDF and exports PDFs to Word, Excel, PowerPoint and JPG. It also supports page extraction, reordering, splitting, rotation and removing printing or editing restrictions.
t.me
Telegram link is a Telegram channel, group, or bot link for updates, files, community posts, or support.
onlineocr.org
OnlineOCR is an online optical character recognition service that converts images and PDF files to text. It supports formats such as JPG, PNG, GIF, JFIF, HEIC and PDF, and offers simple OCR as free raw text recognition alongside a premium OCR mode for tables, lists and headings. The site lists more than 100 languages for recognition.
github.com
ONNX-MLIR provides compiler technology that transforms a valid Open Neural Network Exchange (ONNX) graph into code implementing the graph with minimum runtime support. It is based on LLVM/MLIR compiler technology and contributes an ONNX Dialect and a driver that lower ONNX graphs into MLIR files or LLVM bytecodes.
odfinder.github.io
Open Directory Finder is a web tool that enables users to search for various content types such as video, audio, pictures, software, and games across open directories. It offers loose and strict search modes.
eyeofjustice.com
Open directory search page for finding browsable folders and public file listings.
openexoplanetcatalogue.com
The Open Exoplanet Catalogue is a decentralized, open-source database of discovered extrasolar planets. The website displays the catalogue in a browser, while the data is stored as human-readable XML files in a git version control system. Contributions and corrections are accepted from professional astronomers and the public, and data can be downloaded from the GitHub repository.
open-notebook.ai
Open Notebook is an open-source, AI-powered note-taking and research platform focused on user privacy. It includes a podcast generator that transforms notes into customizable audio content, AI tools for summarizing notes and generating insights, granular privacy controls for AI data access, and support for integrating links, PDFs, text files, presentations, YouTube videos and other content types. The platform is designed for researchers, students, and learning enthusiasts.
open-power-system-data.org
Open Power System Data is a free-of-charge data platform for electricity system researchers and power system modelling. It collects, checks, processes, documents and publishes publicly available power system data that is inconvenient to use, covering installed generation capacity, individual power plants and time series such as consumption, spot prices and wind and solar generation. Processing scripts are open source on GitHub and data is published primarily as CSV files with JSON metadata.
oyc.yale.edu
Open Yale Courses is a free educational resource providing full sets of materials for Yale undergraduate courses. Each course includes high-quality recorded video lectures, syllabi, suggested readings, exams, and problem sets. Lectures are available as downloadable videos, audio-only files, and searchable transcripts. Some previously listed courses have been removed and are now accessible via Yale's official Coursera platform.
github.com
Open-Source iOS Apps is a collaborative list of open-source iOS applications. The repository is tagged for topics including app, apple, ios, ipad, iphone, swift, swiftui and tvos. It includes README, APPSTORE, ARCHIVE, LATEST and contents.json files, a CC0-1.0 license and contributing guidance.